前几天编程虽然一直都成功，但是有个问题就是我们总是在重复开启eXosip_event_wait(0,50)函数，现在打算围绕eXosip_event_wait展开，即eXosip_event_wait一直处以循环跑。

--------海xx程序研究--------

参看下海xx的程序，是如下所示的，在imsUA.c中的main函数中有如下函数：

g_timeout_add (200, get_exosip_events, imsUA);

解释如下：

g_timeout_add (guint interval,
               GSourceFunc function,
               gpointer data);

第一个参数是间隔的毫秒数，第二个参数是定时后的callback，第三个是传递给callback的数据。海xx的程序是指每隔200ms进行如下流程，对不同的事件进行不同的响应。

int get_exosip_events(gpointer main_window)
{
 eXosip_event_t *je;
 char display[500] = "";
  eXosip_lock();
 eXosip_unlock();
 
 
 if((je = eXosip_event_wait(0,50)) != NULL)
 {
  
  // fprintf(stderr, "Event type: %d %s\n", je->type, je->textinfo);

  imsua_display_event_info(je);

  if (je->type == EXOSIP_CALL_INVITE)
  {
   ims_process_incoming_invite(je);
  }
  else if (je->type == EXOSIP_CALL_REINVITE)
  {
   ims_process_incoming_reinvite(je);
  }
  else if (je->type == EXOSIP_CALL_RINGING)
  {
   ims_process_18x(je);
  }
  else if (je->type == EXOSIP_CALL_GLOBALFAILURE)
  {
   ims_process_released_call(je);
  }
  else if (je->type == EXOSIP_CALL_CLOSED)
  {
   ims_process_released_call(je);
  }
  else if (je->type == EXOSIP_CALL_ANSWERED)
  {
   ims_process_200ok(je);
   
  }
  else if (je->type == EXOSIP_CALL_RELEASED)
  {
   ims_process_released_call(je);

  }
  else if (je->type ==  EXOSIP_CALL_CANCELLED)
  {
    ims_process_released_call(je);
  }
  else if (je->type == EXOSIP_CALL_ACK)
  {
   ims_process_ack(je);
  }
  else if (je->type == EXOSIP_CALL_MESSAGE_REQUESTFAILURE)
  {
   ims_process_released_call(je); 
  }
  else if (je->type == EXOSIP_CALL_REQUESTFAILURE)
  {
   set_display("Call released");
  }
  else if (je->type == EXOSIP_CALL_SERVERFAILURE)
  {
   set_display("Call released by server");
  }
  else if (je->type == EXOSIP_CALL_MESSAGE_NEW)
  {
   if (MSG_IS_PRACK(je->request))
    ims_process_prack(je);
   else if (MSG_IS_UPDATE(je->request))
    ims_process_update(je);
   else if (MSG_IS_INFO(je->request))
    common_process_info(je);
  }
  else if (je->type == EXOSIP_CALL_MESSAGE_ANSWERED)
  {
   if (MSG_IS_BYE(je->request))
    ims_process_released_call(je);
   else if (MSG_IS_UPDATE(je->request) || MSG_IS_PRACK(je->request))
    ims_process_2xx(je);
  }
  else if (je->type == EXOSIP_MESSAGE_NEW)
  {  
   if (MSG_IS_MESSAGE(je->request))
   {
    
    char sending_ui[50];
    strcpy(sending_ui,(((je->request)->to)->url)->username);
    strcat(sending_ui,"@");
    strcat(sending_ui,(((je->request)->to)->url)->host);
          
    char *temp;
    temp = strstr(pref->impu,":") + 1;
          
    if(strcmp(sending_ui,temp)==0)
    {
     ims_start_im_session(je);
    }
    
   }
   else if (MSG_IS_BYE(je->request))
   {
    set_display("Call ended");
   }
   
  }
  else if(je->type == EXOSIP_MESSAGE_REQUESTFAILURE)
  {

  }
  else if(je->type == EXOSIP_MESSAGE_ANSWERED)
  {

  }
  else if(je->type == EXOSIP_REGISTRATION_SUCCESS)
  {

   if(is_message_deregister == 1)
   {
    registered = NOT_REGISTERED;

    is_message_deregister = 0;
    
    sprintf(display, "Deregistered with %s",pref->realm);
    set_display(display);
     
    sprintf(display,"Not registered");
    set_status_bar(display);

    watchers_remove_all_watchers();

    num_associated_uris = 0;
    
   }
   else
   {
    registered = REGISTERED;
    ims_process_registration_200ok(je);

   }
  }
  else if(je->type == EXOSIP_REGISTRATION_FAILURE)
  {

   if((je->response)== NULL)
   {
    set_display("Registration failed for unknown reason\nMost probably incorrect credentials\n\nCheck Preferences");
   }
   else if(((je->response)->status_code == 403))
   {
    set_display("Invalid user name\n\nCheck Preferences");
   }
   else if(((je->response)->status_code == 401))
   {
    ims_process_401(je);
   }
   else if(((je->response)->status_code == 404) || ((je->response)->status_code == 407))
   {
 
    set_display("Error with credentials\n\nCheck Preferences");
   }
   else
   {
    set_display("Registration failed for unknown reason\n\nMost probably incorrect credentials\nCheck Preferences");
   }
   
  }
  else if(je->type == EXOSIP_REGISTRATION_REFRESHED)
  {
   set_display("Regsitration Refreshed");
   registered = REGISTERED;
  }
  else if(je->type == EXOSIP_REGISTRATION_TERMINATED)
  {
  }
  else if(je->type == EXOSIP_SUBSCRIPTION_ANSWERED)
  {

  }
  else if (je->type == EXOSIP_SUBSCRIPTION_NOTIFY)
  {
   ims_process_notify(je);
   
  }
  else if (je->type == EXOSIP_SUBSCRIPTION_REQUESTFAILURE)
  {

  }
  else if(((je->response)->status_code == 302))
  {
   ims_process_302(je);
  }
  else
  {
  }
  
 }

 return TRUE;
}

----------------------------

好了，GTK有上述函数，那现在需要在VC++上实现需要使用线程函数，孙鑫教程中使用了CreateThread函数，但是网上更加推荐_beginthreadex，函数，使用起来也非常简单，由于这个日志也算是回炒了，现在看起来也没什么，但是当时没有涉猎线程的概念，成功的意义倒是非常大。

原始的Dos的线程这里已经丢失了，就贴下在MFC的线程函数，注意加上<process.h>：

//---线程启动---

HANDLE h_event;

h_event = (HANDLE)_beginthreadex(NULL,0,Event_react,m_hWnd,0,NULL); 

CloseHandle(h_event);

//线程函数

unsigned __stdcall Event_react( void* pArguments )

{

  。。。。。

}

即可。

使用了事件响应线程之后，让后台不断的读取到来事件并作出响应，就可以实现客户端和服务端的统一。